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# handler.py
import torch
from transformers import AutoTokenizer, AutoModelForCausalLM
from peft import PeftModel
from huggingface_hub import snapshot_download
BASE_MODEL = "deepseek-ai/DeepSeek-R1-Distill-Qwen-1.5B"
ADAPTER_PATH = "GilbertAkham/deepseek-R1-multitask-lora"
class EndpointHandler:
def __init__(self, path=""):
print("🚀 Loading base model...")
self.tokenizer = AutoTokenizer.from_pretrained(BASE_MODEL, trust_remote_code=True)
base_model = AutoModelForCausalLM.from_pretrained(
BASE_MODEL,
torch_dtype=torch.float16,
device_map="auto",
trust_remote_code=True
)
print(f"🔗 Downloading LoRA adapter from {ADAPTER_PATH}...")
adapter_local_path = snapshot_download(repo_id=ADAPTER_PATH, allow_patterns=["*adapter*"])
print(f"📁 Adapter files cached at {adapter_local_path}")
print("🧩 Attaching LoRA adapter...")
self.model = PeftModel.from_pretrained(base_model, adapter_local_path)
self.model.eval()
print("✅ Model + LoRA adapter loaded successfully.")
def __call__(self, data):
prompt = data.get("inputs", "")
inputs = self.tokenizer(prompt, return_tensors="pt").to(self.model.device)
with torch.no_grad():
outputs = self.model.generate(
**inputs,
max_new_tokens=512,
temperature=0.7,
top_p=0.9,
do_sample=True,
pad_token_id=self.tokenizer.eos_token_id,
eos_token_id=self.tokenizer.eos_token_id,
)
text = self.tokenizer.decode(outputs[0], skip_special_tokens=True)
return {"generated_text": text}
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